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Finding the Fourth Proportional to 1,127.19, 1,690.78 and 396.68

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Solution

The fourth proportional to 1,127.19, 1,690.78 and 396.68 is: 595.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.19 : 1,690.78 = 396.68 : x
  2. Step 2: Convert to fraction form
    1,127.19/1,690.78 = 396.68/x
  3. Step 3: Cross multiply
    1,127.19x = 1,690.78 × 396.68
  4. Step 4: Simplify right side
    1,127.19x = 670,698.61
  5. Step 5: Solve for x
    x = 670,698.61/1,127.19
  6. Step 6: Final answer
    x = 595.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.